Equations for time and rate problems and their solutions

52. How can a graph be used to determine how many solutions an equation has?

8. Bobbi picks 1 qt in 20 minutes. Blanche picks 1 qt in 25 minutes. How long would it take them to pick one quart if they work together?

14. The speed of a freight train is 15 mph slower than the speed of a passenger train. The freight train travels 390 miles in the same time that it takes the passenger train to travel 480 miles. Find the speed of each train.

44. It takes 60 oz. of grass seed to seed 3000 ft ^2 of lawn. At this rate, how much would be needed to seed 5000 ft^2 of lawn?

52. How can a graph be used to determine how many solutions an equation has?

Plot y against x. The values of x at which the plot cuts the x axis are the solutions. The number of points at which the x axis is crossed is the number of solutions.

8. Bobbi picks 1 qt in 20 minutes. Blanche picks 1 qt in 25 minutes. How long would it take them to pick one quart if they work together?

Let the rate at which Bobbi works = x qt/min
Let the rate at which Blanche works = y qt/min
Combined rate = x + y qt/min
Time taken to ...

Solution Summary

Sets up equations for time and rate problems and solves them.

...Solutions to these problems explain the steps and formulas to ... standard deviation, coefficient of variation, required rate of return and SML equation. ...

... We can solve these problems using proportions and cross products. ... it's easier to use a handy formula: rate equals distance divided by time: r = d/t ...

... All formula and calculations are shown and explained ... The average cost of this lab time is $11.80 per hour ... The average rate of variable overhead is $7.70 per hour ...

... of the number of weeks you'll be renting for, or whether the time is pro-rated (I've ... to make a choice in order to be able to solve the equation, so let's ...

... At time t = 1 High Price Low Price Gas ... Legend = Value given in problem = Formula/Calculation/Analysis ... on the property) $ 450,000,000 Interest rate on debt ...

... 22. If interest is compounded continuously and the interest rate is tripled ... what effect will this have on the time required for ... Solve each logarithmic equation. ...

...rate examines the interest on a periodic time frame ... The periodic rate formula can be calculated as follows: = (1 ...rate of return, n = number of times the interest ...

... In each case, [X]o=concentration of X at time zero; k = rate constant ... k For a second order reaction, t1/2 = (k*[X]o)-1 Considering the equations shown above ...

... way of visualizing the population/poverty equation: Suppose the world ... asks, in the Sunday New York Times on August ... apparent, arguably for the first time in the ...